methlation

Deinococcus radiodurans is an extremophilic microorganism that possesses a unique DNA damage repair system, conferring a strong resistance to radiation, desiccation, oxidative stress, and chemical damage. Recently, we discovered that D. radiodurans possesses an N4-methylation (m4C) methyltransferase called M.DraR1, which recognizes the 5'-CCGCGG-3' sequence and methylates the second cytosine. Here, we revealed its cognate restriction endonuclease R.DraR1 and recognized that it is the only endonuclease specially for non-4C-methylated 5'-CCGCGG-3' sequence so far...

BACKGROUND: Uterine corpus endometrial carcinoma (UCEC) is the most common female pelvic malignancy worldwide. N6-methyladenosine (m6 A) plays an important role in various cellular responses, especially in cancer progression. However, the correlation between prognostic UCEC and m6 A RNA methylation regulators remains unclear. METHODS: We used The Cancer Genome Atlas (TCGA) to provide a gene signature that could improve the prognostic evaluation of UCEC patients according to the distinct genetic trait of m6 A RNA methylation regulators from a bioinformatics perspective...

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The present study aimed to investigate elemene's effects on cell proliferation, apoptosis, and the cell cycle in the hepatocellular carcinoma (HCC) cell line, QYG7703, and to investigate GSTP1 gene methylation change in QGY7703 cells after being treated with elemene to explore whether elemene reversed the abnormal GSTP1 gene methylation. QGY7703 cells were treated with different elemene concentrations. Cell proliferation was measured with MTT assay, cell apoptosis and cell cycle were analyzed by flow cytometry, and GSTP1 gene methylation was analyzed by methlation-specific polymerase chain reaction...

AIM: The N-myc down-regulated gene (NDRG) family is a group of genes that have predominantly tumor-suppressive effects. The goal of this study was to investigate the expression of NDRG2 and NDRG4 in surgical specimens of human glioblastoma and in normal brain tissue, and to search for correlations with overall (OS) and progression-free survival (PFS). MATERIALS AND METHODS: Samples from 44 patients (31 males, 13 females; mean age±SD=57.4±15.7 years) with primary (n=40) or recurrent glioblastoma (n=4) were analyzed by quantitative real-time polymerase chain reaction and immunohistochemistry, with dimensionless semiquantitative immunoreactivity score (IRS), ranging from 0-30] for expression of NDRG2 and NDRG4...

Some peculiarities of compactization of double-stranded DNA molecules containing methylated nitrogen bases have been studied in water-salt solutions of PEG. It is shown that the methylation of N7-atoms of guanyl residues in original DNA molecules does not prevent the formation of DNA compact particles, but results in a decrease of the amplitude of the negative band in the CD spectrum of compact particles. The influence of N7-guanine methylation on the shape of the CD spectrum being the greater, the lower is the concentration of PEG...

Marked differences were seen between the metabolism of L-[3-14C] tryptophan and of [2-14C]serotonin by the intact chick pineal gland in organ culture. The major metabolite of tryptophan recovered by our procedures was melatonin, which accounted for about half the radioactivity recovered as metabolic products. In contrast, the principal product of serotonin metabolism recovered was hydroxyindoleacetic acid, and the yield of products derived through monoamine oxidase (EC 1.4.3.4) activity vastly exceeded that of melatonin...

This investigation was designed to explore transfer RNA (TRNA) methyltransferase activity, urinary excretion levels of tRNA degradation products, and tRNA base composition in normal monkeys and in those with hepatocellular carcinomas induced by N-nitrosodiethylamine. After the development of the tumor, 24-hr urine specimens were collected, the monkeys were sacrificed, and the livers were removed for tRNA isolation and methyltransferase activity studies. The tRNA methyltransferase activity and capacity and the urinary excretion levels for selected tRNA degradation products (pseudouridine, N2,N2-dimethylguanosine, 1-methylinosine, 7-methylguanine, and beta-aminoisobutyric acid) were elevated for the hepatoma-bearing monkeys when compared to those with normal liver...